Optional. SAS URL for a container in a storage account. E.g.
https://NAME.blob.core.windows.net/CONTAINERNAME/?sv=2012-02-12&st=2013-12-05T19%3A30%3A45Z&se=2017-12-04T19%3A30%3A45Z&sr=c&sp=rwdl&sig=abcdefABCDEFabcdef0123456789